Not quite the same sort of incident but it reminds me of something funny that happened at a recent (last year I think) Stranglers gig in Preston.
Late in the gig during No More Heroes, a bloke jumps on stage, "dances" about for a bit and is promptly thrown out of the side door of the venue. Baz Warne instantly changes the next line of the song to "whatever happened to, that little geezer, he got his arse slapped*, and now he's outside."
* said geezer didn't really get slapped as far as I know, he was just first to the bar back over at the pub and looked happy enough (and well pissed) post gig!
H